1,4-CyclohexanedioneMono(2,2-DimethyltrimethyleneKetal)3,3-二甲基-1,5-二氧杂螺[5,5]十一烷-9-酮cas#69225-59-8contents:99%minappearance:off-whitecrystalpowderusage:mainlyusedtobepharmaceuticalintermediatesuchasfrovatriptan)